rule win_mirai_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.mirai."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.mirai"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { ff75fc 8b45f8 8b00 8b4df8 034804 e8???????? 8b45f8 }
            // n = 7, score = 100
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   034804               | add                 ecx, dword ptr [eax + 4]
            //   e8????????           |                     
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]

        $sequence_1 = { 8b4df8 ff5008 c9 c3 55 8bec 51 }
            // n = 7, score = 100
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   ff5008               | call                dword ptr [eax + 8]
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx

        $sequence_2 = { e8???????? c645fc07 ffb554ffffff 8d8d7cffffff e8???????? c645fc08 8d4598 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   c645fc07             | mov                 byte ptr [ebp - 4], 7
            //   ffb554ffffff         | push                dword ptr [ebp - 0xac]
            //   8d8d7cffffff         | lea                 ecx, [ebp - 0x84]
            //   e8????????           |                     
            //   c645fc08             | mov                 byte ptr [ebp - 4], 8
            //   8d4598               | lea                 eax, [ebp - 0x68]

        $sequence_3 = { 8d8520ffffff 50 e8???????? 83c40c 6a20 ff7510 8d8520ffffff }
            // n = 7, score = 100
            //   8d8520ffffff         | lea                 eax, [ebp - 0xe0]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6a20                 | push                0x20
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   8d8520ffffff         | lea                 eax, [ebp - 0xe0]

        $sequence_4 = { f7d1 234c2438 83c408 84c9 8b4c2428 5d 7805 }
            // n = 7, score = 100
            //   f7d1                 | not                 ecx
            //   234c2438             | and                 ecx, dword ptr [esp + 0x38]
            //   83c408               | add                 esp, 8
            //   84c9                 | test                cl, cl
            //   8b4c2428             | mov                 ecx, dword ptr [esp + 0x28]
            //   5d                   | pop                 ebp
            //   7805                 | js                  7

        $sequence_5 = { ff7004 8b4df8 e8???????? ff7508 8b45f8 ff7004 8b45f8 }
            // n = 7, score = 100
            //   ff7004               | push                dword ptr [eax + 4]
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   e8????????           |                     
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   ff7004               | push                dword ptr [eax + 4]
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]

        $sequence_6 = { a1???????? 33c4 8944244c 837c246400 53 55 8b6c2464 }
            // n = 7, score = 100
            //   a1????????           |                     
            //   33c4                 | xor                 eax, esp
            //   8944244c             | mov                 dword ptr [esp + 0x4c], eax
            //   837c246400           | cmp                 dword ptr [esp + 0x64], 0
            //   53                   | push                ebx
            //   55                   | push                ebp
            //   8b6c2464             | mov                 ebp, dword ptr [esp + 0x64]

        $sequence_7 = { ff8da8fcffff 0f8507ffffff 8b4dfc 8b85acfcffff 5f 5e 33cd }
            // n = 7, score = 100
            //   ff8da8fcffff         | dec                 dword ptr [ebp - 0x358]
            //   0f8507ffffff         | jne                 0xffffff0d
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   8b85acfcffff         | mov                 eax, dword ptr [ebp - 0x354]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   33cd                 | xor                 ecx, ebp

        $sequence_8 = { 8d5d80 2bd9 899d78ffffff 8d570c 8d5d84 33f6 2bf9 }
            // n = 7, score = 100
            //   8d5d80               | lea                 ebx, [ebp - 0x80]
            //   2bd9                 | sub                 ebx, ecx
            //   899d78ffffff         | mov                 dword ptr [ebp - 0x88], ebx
            //   8d570c               | lea                 edx, [edi + 0xc]
            //   8d5d84               | lea                 ebx, [ebp - 0x7c]
            //   33f6                 | xor                 esi, esi
            //   2bf9                 | sub                 edi, ecx

        $sequence_9 = { eb9b e9???????? 8365f000 6aff 8d45f0 50 8b4db8 }
            // n = 7, score = 100
            //   eb9b                 | jmp                 0xffffff9d
            //   e9????????           |                     
            //   8365f000             | and                 dword ptr [ebp - 0x10], 0
            //   6aff                 | push                -1
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   50                   | push                eax
            //   8b4db8               | mov                 ecx, dword ptr [ebp - 0x48]

    condition:
        7 of them and filesize < 7086080
}